George and Harold, and their doubles, Yesterday George and Yesterday Harold, have a good thing going. Two of them go to school, while the other two hide in the tree house and play video games all day-then they switch! But when their malicious gym teacher, Mr Meaner, creates a method of mind control that turns their fellow students into attentive, obedient, perfect children, the future of all humanity will be in their hands!

Alexander has just moved into Stermont, but the elementary school is being torn down, his new classroom is located in the hospital morgue, a notebook he finds is full of information about monsters--and everywhere he turns there are spooky balloon men determined to attack him.

Alexander is used to finding monsters everywhere in Stermont, but now the school is being turned into an icebox by giant meat-eating vegetables--and his friend Rip has gone missing.

Alexander and his new friend, Rip, are worried that the worms the rain has brought out are really the megaworms that Notebook of Doom describes but they soon discover that the night crawlers are trying to warn them about the monster tunnel fish that are threatening Stermont Elementary.

Ever since he ate a zapped banana, hyperactive second-grader Clyde turns into a monkey when he gets excited, so his twin sister Claudia plans to take her "monkey" to the school pet show--but when all the animals are pet-napped Clyde has to use his inner monkey to rescue them.

Missy wants to take home the class pets, but another girl, Tiffany, has already asked their teacher so Missy and her friend Oscar need to come up with a plan to make Tiffany change her mind.

Mandy knows she would be perfect for the role of George Washington in her second-grade class presidential pageant but Mandy's teacher has other casting plans. Mandy already leaps out of the shadows created by her younger siblings and she is not going to be ignored at school too.

"A.J. is turning nine, so he's inviting all his family, friends, and favorite teachers over for a backyard birthday bash. His parents even hire a popular party planner, Mr. Marty. But what happens when Mr. Marty accidentally orders rival clowns, a bubble blower, and even a singing cowboy to entertain guests?"--

"Clyde has a secret. Whenever he gets too excited, he changes into a monkey. His twin sister, Claudia, is worried that this isn't good for him. But when a ghost is seen in their school's hallway, Clyde will have to use his monkey powers to save they day. Will Clyde ever be a normal boy again?--Jacket.

Sam Graves discovers that his elementary school is alive and plotting against the students, and,as hall monitor, it is his job to protect them--but he will need some help from his friends.